A study found that eating whole grains can help to prevent acne. An American Journal of Clinical Nutrition paper reported that when people cut refined carbs from their diet and increased high-fiber grains, they had half as many pimples after 12 weeks. The fiber in whole grains helps the body absorb and burn carbs more slowly, which keeps blood sugar and insulin levels steady.
Less healthy carbohydrates, such as white bread and pastries, encourages the pancreas to send out a surge of insulin, which triggers hormone-levels to change, oil production to increase, and cells to multiply. This chain of events clogs pores and causes acne.